uxcell Hole Plugs Black Plastic 20mm(13/16-inch) Snap in Locking Hole Tube(19.5-20mm) Steel Furniture Fencing Post Pipe Insert End Caps for Fitness Equipment 25 Pcs

You're gonna want to order these. Without the air dam, the control arms catch the wind and make a weird humming noise at low speeds. A skid plate also looks good once you take off the dam👌